Control-cash flow divergence mechanisms; Disproportional ownership mechanisms; Mechanisms of separation between ownership and control; Ownership structures Definition Control-enhancing mechanisms (also called CEMs) identify the governance devices responsible for increasing the corporate control (Lin 2017; Saggese et al. 2016). Such mechanisms foster the deviation from the proportionality principle (i.e., "one share-one vote" rule-OSOV rule) between cash flow rights and voting rights (Adams and Ferreira 2008; Burkart and Lee 2008; Grossman and Hart 1988) and concentrate the firm control in the hands of a limited group of shareholders (i.e., blockholders/majority shareholders) (Deminor Rating 2005; Institutional Shareholder Services 2007). What We Know and What We Have Learned on CEMs Control-enhancing mechanisms can be classified in some categories. A first group comprises the devices able to enhance the blockholders' control by leveraging the voting power (e.g., pyramidal